UK to Test Nationwide Emergency Alert on 7 September
The UK government has announced that a nationwide test of the Emergency Alerts system will take place on Sunday, 7 September 2025, at exactly 3pm. This is the second major trial of the system, following the first in April 2023, and it has been scheduled to make sure the technology works smoothly if it is ever needed in a real emergency.
When the test happens, millions of mobile phones and tablets across the UK will light up, vibrate, and emit a loud siren-like sound lasting around ten seconds. The message that appears will clearly explain that it is only a test and that no action needs to be taken. The alert will reach compatible devices connected to 4G and 5G networks, even if mobile data or Wi-Fi is switched off. Phones that are turned off or on older 2G and 3G networks will not receive it.
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The purpose of this system is to warn the public about serious threats to life, including extreme weather, natural disasters, major accidents, or even incidents such as a terror attack. In the past, the alerts have already been used in the UK during dangerous storms and even to coordinate evacuations, such as when a World War Two bomb was discovered in Plymouth earlier this year. In that case, over 10,000 residents were safely evacuated thanks to quick communication through these alerts.
The government has said that most modern smartphones are able to receive the message, and it is expected that around 95% of the population with access to 4G or 5G will hear the alarm. However, during the first test in 2023, some technical glitches were reported. For example, people on certain networks did not receive the message at all, while others received it more than once. About 7% of compatible phones missed the alert entirely. Officials have promised that improvements have been made since then to fix these problems before the September trial.
Not everyone will want to receive these notifications. The government strongly recommends keeping them switched on for safety reasons, but it is possible to opt out by going into phone settings and disabling “severe alerts” or “extreme alerts.” This choice has been particularly important for victims of domestic abuse who may keep a concealed phone hidden from an abuser. Charities have advised those individuals to switch off secret devices completely during the test so they are not exposed by the unexpected alarm.
The trial is part of ongoing efforts to make sure that when real danger arises, information can be delivered quickly, directly, and reliably to those at risk. The loud noise and vibration are designed to grab attention even if the phone is in a pocket or on silent. In a genuine emergency, the instructions in the alert should be followed immediately to help keep people safe.
So on 7 September, if your phone suddenly buzzes loudly at 3pm, there is no need to panic—it will simply be the UK’s national test of a system that could one day save lives.
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